A replica of a Saturn V rocket in the Rocket Park at the U.S. Space & Rocket Center rises above a nearby store on in Huntsville, Ala., ground zero for U.S. rocketry, and where NASA is designing its biggest ever to take astronauts farther.

A replica of a Saturn V rocket in the Rocket Park at the U.S. Space...

HUNTSVILLE, Ala. - Todd May's corner office overlooks the tree-lined hills where Wernher von Braun made the most powerful rockets the world has ever known.

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